Originally Posted by gilby
Might anyone know what the temperature sweep is on the stock temp gauge? '94 D90.
Mine will get into red, but an IR thermometer reads only 200F at the sending unit.
Might be a bad ground ... there are 3 wires on the gauge ...
ground .. jump this direct to your battery -ve.
12V ... jump this direct to your battery +ve
and the sensor ... run a replacement /temp wire
that way you can replace the wires one at a time and figure whats causing the excessive sweep. If it still does it then the gauge of sensor are faulty. Sensor can be tested with a multi meter for resistance. Gauge I'm not sure.
Many people move to VDO at this point!